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H. D. HODGEMAN.

SCREW PROPELLER. No. 390,367. Patented Oct. 2. 1888.

WITNESSES: v INVENTOR 6. (52 W ATTORNEY N, PETERS. Plwlo-blhugnpher,Wilmington. D. C,

NTTED STATES PATENT @Trics.

HENRY D. HODGEMAN, OF BALDWINSVILLE, NEW YORK.

SC REW=PROPELLER.

SPECIFICATION forming part of Letters Patent No. 390,367, dated October2, 1888.

Application filed April 11. 1888. Serial No.270,3l6. iModel.)

To all whom it may concern:

Be it known that l-, HENRY D. HODGEMAN,

of Baldwinsville, in the county of Onondaga and State of New York, haveinvented a new and Improved Propeller-Wheel, of which the following is afull, clear, and exact description.

My invention relates to an improved propeller-wheel for water,wind, orsteam, adapted for use in connection with vessels as a ventilatonwheel,or for kindredpurposcs, and has for its object to construct a wheel in asimple manner, which will produce a maximum power and be subjected to aminimum degree of frictin, and wherein the wheel when used in thepropulsion of vessels will not produce a perceptible or destructivemovement of the water.

The invention consists in the construction of the several parts of thewheel, as will be hereinafter fully set forth, and pointed out in theclaim.

Reference is to be had to the accompanying drawings, forming a part ofthis specification, in which similar letters of reference indicatecorresponding parts in both figures.

Figure l is a plan view of the wheel, and Fig. 2 is a central verticalsection thereof.

In carrying out the invention the wheel consists of a series of blades,A, radiating in a diagonal line from a central hub, a, which blades turnas they approach the periphery of the wheel, as shown at b, to lie in aplane at right angles with the hub.

The blades A, at their outer extremities, are merged into a peripheralband or ring, B, and are thickest at thcpoint ofintersection, d, withthe hub and thinnest at their intersection, d, with the periphery.

By reason of the aforesaid construction of the blades a series ofsubstantially circular openings, D, are provided between the hub andperiphery, which openings project diagonally through the wheel in adouble curve or S- shaped line, as best illustrated in Fig. 2.

The wheel may be of any desired thickness and the blades of any desiredpitch until the said wheel shall have approached in contourapproximately a sphere.

It is evident from the construction of the wheel that the same may bemade lighter than heretofore, and yet be as strong, and. that, owing tothe peculiar curve of the apertures, the blades, While presenting at theproper point and time an efficient bearing-surface to the water, wind,or steam, will not in their revolntion produce any harmful work.

The device may be used as a steampiston and valve combined, or a wheelfor pumping water, or a wind-wheel when inclosed in a suit ablecylinder.

Having thus described my inventiomwhat I claim as new, and desire tosecure by Letters Patent, is

A wheel consisting of a series of blades radiating diagonally from acentral hub, turning as they approach the periphery to lie in a plane atright angles to the hub, said blades merging intoa peripheral ring andconstructed thickest at their point ofintersection with the hub andthinnest at the periphery, whereby essentially circular openings areformed projecting diagonally through the wheel in a double curve orS-shaped line, substantially as shown and described.

HENRY D. HODGEM AN.

YVitnesses:

HARRY P. BIGELOW, Lucian E. SMITH.

